Years ago perfect circle ran some tests on ring rotation and found that the top ring turned several revolutions in their test. I don't know how they monitored it but they had some type of equipment that would sense what ever they inserted into the ring.
Your rings with expanders under them or ones with the expanders or tension device and rails don't really move or very little according to perfect circle.
Perfect Circle used to give seminars on their products at the local parts stores.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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